From: Avi Kivity <[email protected]> commit 831ca6093ca486060721f5c3c74f97b10f3172b9 upstream.
With CONFIG_CC_STACKPROTECTOR, we need a valid %gs at all times, so disable lazy reload and do an eager reload immediately after the vmexit. Reported-by: IVAN ANGELOV <[email protected]> Acked-By: Joerg Roedel <[email protected]> Signed-off-by: Avi Kivity <[email protected]> --- arch/x86/kvm/svm.c | 5 +++++ 1 files changed, 5 insertions(+), 0 deletions(-) diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 63fec15..9cc8496 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -1153,8 +1153,10 @@ static void svm_vcpu_put(struct kvm_vcpu *vcpu) wrmsrl(MSR_KERNEL_GS_BASE, current->thread.gs); load_gs_index(svm->host.gs); #else +#ifdef CONFIG_X86_32_LAZY_GS loadsegment(gs, svm->host.gs); #endif +#endif for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++) wrmsrl(host_save_user_msrs[i], svm->host_user_msrs[i]); } @@ -3641,6 +3643,9 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu) wrmsrl(MSR_GS_BASE, svm->host.gs_base); #else loadsegment(fs, svm->host.fs); +#ifndef CONFIG_X86_32_LAZY_GS + loadsegment(gs, svm->host.gs); +#endif #endif reload_tss(vcpu); -- 1.7.1 _______________________________________________ stable mailing list [email protected] http://linux.kernel.org/mailman/listinfo/stable
